According to this reference, Highway 75 was built based on the original oxcart trails coming through the St. Vincent/Pembina area, branching out through Kittson County where primitive roads were already being built as locals best could put them together.

Despite what the reference further contends regarding a "good roads act" in 1913, official references say that the Federal Aid Road Act wasn't passed until 1916. The nation's leaders on the federal and state level could plainly see that to meet economic/transportation growing demands, it was an absolute necessity to provide good infrastructure.